As far as "modern times" go, it might be useful to remember that Ikea is a company that's been around for longer than most people realize. The company was founded in 1943 in Sweden, and was a chain by the 1960's. So, it's had a long time to immerse itself into various cultures.
One thing that I find interesting is that I use the term "flatpack" for Ikea and other "build-your-own" furniture, but it's a Britishism, and not everyone in California knows what I mean. So, there is already a generic term for the stuff that Ikea sells, and that term is in regular use in Europe, but not in the States.